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>DataparkSearch Engine 4.51: Reference manual</TH
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>Chapter 5. Storing data</TD
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><H1
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><A
NAME="searchd"
>5.4. SearchD support</A
></H1
>
	
<A
NAME="AEN2984"
></A
>

	

	<DIV
CLASS="sect2"
><H2
CLASS="sect2"
><A
NAME="searchd-why"
>5.4.1. Why using searchd</A
></H2
>
		
		<P
></P
><UL
><LI
>&#13;				<P
>Faster searching, especially when using
ISpell, synonyms or segmenters for east asian languages. Related files are loaded into memory when searchd
is started, while <TT
CLASS="filename"
>search.cgi</TT
> loads data before
every query.</P
>
<P
>Also, <B
CLASS="command"
>searchd</B
> can preload url info data (20 bytes per URL indexed) and 
cache mode limits (4 or 8 bytes per URL depend on limit type). This allow reduce average search time.
</P
>
			</LI
><LI
>&#13;				<P
>It is possible to distribute
words index and web-server between different machines.</P
>
			</LI
></UL
>
	</DIV
>

	<DIV
CLASS="sect2"
><H2
CLASS="sect2"
><A
NAME="searchd-start"
>5.4.2. Starting searchd</A
></H2
>
		
		<P
>To start using searchd:</P
>
		<P
></P
><UL
><LI
>&#13;				<P
>Copy <TT
CLASS="filename"
>$PREFIX/etc/searchd.conf-dist</TT
> to <TT
CLASS="filename"
>searchd.conf</TT
>.</P
>
			</LI
><LI
>&#13;				<P
>Edit <TT
CLASS="filename"
>searchd.conf</TT
>.</P
>
			</LI
><LI
><P
>&#13;<A
NAME="AEN3009"
></A
>
If you need preload url data to speed-up searches (this cost about 20 bytes of memory per url),
add the following command to <TT
CLASS="filename"
>searchd.conf</TT
>:
				<PRE
CLASS="programlisting"
>&#13;PreloadURLData yes
</PRE
>
</P
>
</LI
><LI
><P
>&#13;<A
NAME="AEN3016"
></A
>
You may also preload cache mode limits for most frequently used limit values using
<B
CLASS="command"
>PreloadLimit</B
> command in <TT
CLASS="filename"
>searchd.conf</TT
> file:
				<PRE
CLASS="programlisting"
>&#13;PreloadLimit &#60;limit type&#62; &#60;limit value&#62;
</PRE
>
</P
>
<P
>For example:
			<PRE
CLASS="programlisting"
>&#13;PreloadLimit tag Unix
</PRE
>
</P
>
</LI
><LI
>&#13;				<P
>Add the following command to <TT
CLASS="filename"
>search.htm</TT
>:</P
>
				<P
>&#13;<TT
CLASS="literal"
>DBAddr searchd://hostname/</TT
> or <TT
CLASS="literal"
>DBAddr searchd://hostname:port/</TT
>, e.g.
				<PRE
CLASS="programlisting"
>&#13;DBAddr searchd://localhost/
</PRE
>
</P
>
				<P
>Default <TT
CLASS="literal"
>port</TT
> value is 7003</P
>
			</LI
><LI
>&#13;<P
><A
NAME="AEN3035"
></A
>
You may start several searchd's children answering search queries simultaneously. Use <B
CLASS="command"
>MaxClients</B
> comamnd to specify the number of
searchd's children. Value by default is 1.
</P
>
<PRE
CLASS="programlisting"
>&#13;MaxClients 2
</PRE
>
</LI
><LI
>&#13;				<P
>Start searchd:</P
>
				<P
>&#13;					<KBD
CLASS="userinput"
>/usr/local/dpsearch/sbin/searchd &#38;</KBD
>
				</P
>
			</LI
></UL
>
		<P
>To suppress output to stderr, use
<TT
CLASS="literal"
>-l</TT
> option. The output will go through syslog only
(in case syslog support was not disabled during installation with
<TT
CLASS="literal"
>--disable-syslog</TT
>). In case syslog is disabled, it
is possible to direct stderr to a file: </P
>
		<P
>&#13;			<KBD
CLASS="userinput"
>/usr/local/dpsearch/sbin/searchd 2&#62;/var/log/searchd.log &#38;</KBD
>
		</P
>
		<P
>&#13;			<TT
CLASS="literal"
>searchd</TT
> just like
<TT
CLASS="filename"
>indexer</TT
> can be used with an option of a
configuration file, e.g. relative path to <TT
CLASS="filename"
>/etc</TT
>
directory of <SPAN
CLASS="application"
>DataparkSearch</SPAN
> installation:
		<PRE
CLASS="programlisting"
>&#13;searchd searchd1.conf
</PRE
>
		</P
>
		<P
>or with absolute path:</P
>
		<P
>&#13;			<KBD
CLASS="userinput"
>searchd /usr/local/dpsearch/etc/searchd1.conf</KBD
>
		</P
>
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>

	

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